Shaping Body Geometry for Uniform Large-Diameter Glass Tubes
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Solution Overview
Problem
Existing glass tube production methods using the Vello or down-draw process result in oscillations of the outer diameter due to variations in the weight of the glass drawing strand, leading to non-uniform outer diameters and reduced geometric quality, particularly in tubes with large diameters.
Innovation Solution
Optimizing the shaping body dimensions with a conical and cylindrical section ratio (X/Z between 0.1 and 0.5 and Y/Z between 0.02 and 0.35) to stabilize the glass flow, ensuring a uniform distribution of the glass layer and reducing outer diameter oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Vello or down-draw method is used to produce glass tubes with large outer diameters, then the productivity and capability to produce large diameter tubes is improved, but the outer diameter uniformity deteriorates due to oscillations caused by varying glass drawing strand weight
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric parameters of the shaping body, specifically the conical section angle and cylindrical section dimensions. By adjusting these parameters, the glass flow characteristics are modified to reduce oscillations and improve outer diameter uniformity while maintaining the capability to produce large diameter tubes
Solution Approach 2:
The shaping body is segmented into distinct functional sections: a conical section for initial glass flow distribution and a cylindrical section for stabilizing the glass strand. This segmentation allows each section to perform its specific function optimally, with the conical section managing flow distribution and the cylindrical section maintaining uniformity
2Productivity
If the glass drawing strand weight varies continuously due to cutting sections, then the production process continues without interruption, but the outer diameter oscillation amplitude increases reducing geometric quality
Solution Approach 1:
The cylindrical section of the shaping body acts as a cushioning element that compensates for weight variations in the glass drawing strand. This section provides a stabilizing effect that cushions against the oscillations caused by continuous cutting, maintaining geometric quality throughout continuous production
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves highly uniform outer diameters in glass tubes, reducing the amplitude of outer diameter oscillations and enhancing the geometric quality, especially for tubes with large diameters up to 1000 mm.
Implementation Method 1
a molten glass flows over a shaping body comprised by a shaping mandrel
Implementation Method 2
The glass drawing strand forming at the break-off edge of the shaping body is drawn downwards by a drawing machine and cools during the process
Data Source
AI summary
A glass tube has a center axis, where for the glass tube a specific cross-sectional plane is defined which includes the center axis and which is parallel to the center axis. Within the specific cross-sectional plane, for each pair of outer diameters d1 and d2 of the glass tube at any two arbitrarily selected first axial position x1 and second axial positions x2 along the center axis, respectively, the following relation is 60 or smaller: |(d2−d1)/(x2−x1)|*(10{circumflex over ( )}6 mm)/d1.